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<?php $a = []; $b = array_pop($a); print_r(['b' => $b]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SvNeZ
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'array_pop'
          2        SEND_REF                                                 !0
          3        DO_ICALL                                         $3      
          4        ASSIGN                                                   !1, $3
    7     5        INIT_FCALL                                               'print_r'
          6        INIT_ARRAY                                       ~5      !1, 'b'
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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